Re: Haskell Foldable Wats

On Wed, Feb 24, 2016 at 3:24 PM, Kosyrev Serge <_deepfire@feelingofgreen.ru> wrote:

...

What you seem to be saying, though, is one of two things. 1: "In all contexts, you should only ever use tuples for this purpose", or 2: "If you find another purpose to use tuples for, you shouldn't use

Nathan Bouscal writes: them as Functors" ..

...

Option 2 is more humble in that it allows for the possibility that there's a use-case you're unfamiliar with, but instead it just makes an arbitrary decision that, whatever this unfamiliar use-case is, surely they shouldn't be using Functor. I don't see any way to justify that position.

Crucially -- this is a strawman -- nobody is arguing that Functor should never be defined for tuples.

The argument is against forcing one specific instance of Functor on everybody.

As opposed to what other instance??

-- с уважениeм / respectfully, Косырев Сергей